Anterior Shoulder and Arm Muscle Actions

PT605 Anatomy, Oregon Tech

Serratus Anterior

Scapular depression, upward rotation, protraction, posterior tilt, and holds medial border of scapula against thorax.

Anterior Deltoid

Shoulder abduction, flexion, internal rotation, horizontal adduction

Middle Deltoid

Shoulder abduction

Posterior Deltoid

Shoulder abduction, extension, external rotation, horizontal abduction

Clavicular Head of Pectoralis Major

Shoulder horizontal adduction, internal rotation, adduction, flexion

Sternal Head of Pectoralis Major

Shoulder horizontal adduction, internal rotation, adduction

Costal Head of Pectoralis Major

Shoulder horizontal adduction, internal rotation, adduction, extension

Pectoralis Minor

Scapular depression, downward rotation, protraction, anterior tilt

Subclavius

Clavicular depression, protraction, anterior rotation

Corachobrachialis

Shoulder flexion, adduction, internal rotation, horizontal adduction

Biceps Brachii

Shoulder flexion, elbow flexion, forearm supination

Brachialis

Elbow flexion

Triceps Brachii

Elbow extension, shoulder extension (long head)

Anconeus

Tightens capsule of elbow during elbow extension, weak elbow extension